Crown Audio CL4 - Manual

Crown Audio, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
CL4
7/03 131958-1A
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown ® is a registered trademark of Crown International, Inc.
Printed in U.S.A.
© 2003 Crown Audio, Inc.
Architectural & Engineering Specifications
C O N T R A C T O R S E R I E S
CL4
The amplifier shall be a solid-state two-channel model. Each amplifier
channel shall have the ability to operate individually, or paired with the
other channel in a bridged configuration to provide increased output volt-
age over that of an individual channel output.
Front panel controls shall include a rocker switch for selecting power on
and off. Rear panel controls shall include a recessed detented rotary control
for each channel to adjust input level, a recessed switch to select Stereo
or Bridge modes of operation, and a reset switch for the AC mains circuit
breaker.
Internal controls shall include a jumper block to allow selection of input
sensitivity of either 0.775V or 26 dB gain as a service option. Sensitivity
shall be factory-set to 1.4V.
Front panel indicators shall include a green LED to indicate that the ampli-
fier is turned on and power is applied; a red LED for each channel which
shall blink to indicate any of the following 5 conditions: 1) When the
amplifier is first powered up, until the unit is ready for operation. 2) If
the heatsinks reach a temperature above normal working limits. 3) If the
transformer thermal protection circuit is activated. 4) If the amplifier wires
develop a short circuit, and 5) should the amplifier output stage become
non-operational; a red LED for each channel which shall turn on to indicate
when distortion of any type becomes audible in the amplifier output; and
a green LED for each channel which shall flash dimly to indicate when a
low-level signal (> -40 dBm) is present at the input of the amplifier.
Rear-panel connectors shall include a combination XLR and ¼-in (6.35 cm)
phone connector in parallel with a three-terminal barrier block for each
channel for balanced input connection (on the standard input module);
a four-terminal touch-proof barrier block for output connection (on the
standard output module); and an RJ11 jack for connection to an external
circuit for the purpose of remotely monitoring fault conditions.
The amplifier power requirements shall be 100-240 VAC, at 50/60 Hz. AC
line current requirement shell be 8.5 A at 100 VAC; 7.1 A at 120 VAC;
and 3.7 A at 230-240 VAC. A detatchable IEC 15A to NEMA 5-15P AC line
cord shall be provided for AC connection. Typical quiescent power draw
shall be 140 watts.
The amplifier chassis shall be constructed of steel with a durable black
finish. The amplifier shall employ a cooling system consisting of internal
heat exchangers, along with a variable-speed cooling fan which shall oper-
ate according to internal thermal demand. Airflow through the chassis shall
be from front to rear.
The dimensions of the amplifier shall allow for 19 inch (48.3 cm) EIA Stan-
dard (RS-310-B) rack mounting. The amplifier shall be 5.25 inches (13.34
cm) tall and 16.25-inches (36.56-cm) deep behind the rack-mounting
surface. The amplifier shall weigh 33.3 pounds (15.1 kg).
The amplifier shall be protected against shorted, open or mismatched
loads; overloaded power supplies; excessive temperature; chain destruc-
tion phenomena; input overload damage; and high-frequency blowups.
The amplifier shall protect loudspeakers from input/output DC, large or
dangerous DC offsets and turn-on/turn-off transients.
Input Impedance of the amplifier shall be nominally 20 k ohms, balanced;
nominally 10 k ohms, unbalanced.
The power amplifier shall meet or exceed the following performance criteria
(amplifier in stereo mode with 8 ohm loads and an input sensitivity of
26 dB gain, 1 kHz at rated power unless otherwise specified): Load imped-
ance (safe with all types of loads): 2, 4 & 8 ohm Stereo; 4, 8 & 16 ohm
Bridge. Voltage gain, 1 kHz, 1.4V sensitivity: 34 dB at 4/8 ohm. Output
Power at 1 kHz at rated THD; in Stereo mode at 8 ohms: 600 watts per
channel; in Stereo mode at 4 ohms: 1,200 watts per channel; in Stereo
mode at 2 ohms: 1,800 watts per channel; in Bridge mode at 8 ohms: 2,400
watts; in Bridge mode at 4 ohms: 3,600 watts. Frequency Response, 20
Hz to 20 kHz at 1 watt: ±0.25 dB. Phase Response: ±15 degrees deviation
from linear phase from 20 Hz to 20 kHz at 1 watt. Signal to Noise Ratio,
A-Weighted: Better than 102 dB below rated 1-kHz power. Total Harmonic
Distortion (THD), 1 kHz at rated power: 0.5% or less true THD from 20 Hz
to 20 kHz. Intermodulation Distortion (60 Hz and 7 kHz at 4:1): Less than
0.5% at rated power to 30 dB below rated power at 8 ohms. Damping
Factor (8 ohm): Better than 700 from 10 Hz to 400 Hz. Crosstalk, 20 Hz
to 20 kHz: Better than 50 dB below rated power. Common Mode Rejection
(CMR): Better than 40 dB from 20 Hz to 1 kHz. DC Output Offset (Shorted
Input): ±10 mV.
The amplifier shall be designated the Crown CL4.